Sökning: "non-heme iron"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden non-heme iron.

1. 1. Functional Models for Non-heme Mononuclear Iron Oxygenases

   Författare :Mainak Mitra; Kemisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bioinorganic chemistry; Iron; Oxygenases; Catalysis;

   Sammanfattning : Non-heme mononuclear iron oxygenases catalyze a large number of oxidation reactions in biological systems. The reactions are often proposed to proceed via the intermediacy of high valent Fe(IV) oxo (ferryl) or, Fe(V) oxo (perferryl) intermediates. LÄS MER

3. 2. Theoretical studies of mononuclear non-heme iron active sites

   Författare :Arianna Bassan; Per E. M. Siegbahn; Sason Shaik; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quantum chemistry; enzyme catalysis; iron enzymes; Quantum chemistry; Kvantkemi;

   Sammanfattning : The quantum chemical investigations presented in this thesis use hybrid density functional theory to shed light on the catalytic mechanisms of mononuclear non-heme iron oxygenases, accommodating a ferrous ion in their active sites. More specifically, the dioxygen activation process and the subsequent oxidative reactions in the following enzymes were studied: tetrahydrobiopterin-dependent hydroxylases, naphthalene 1,2-dioxygenase and α-ketoglutarate-dependent enzymes. LÄS MER

4. 3. Iron absorption and iron status related to diet : an experimental and epidemiological study

   Författare :Per Tidehag; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; iron status; iron absorption; bioavailability; dietary fiber; phytate; calcium; radioiron; diet;

   Sammanfattning : The absorption of iron from the diet is a major determinant of the iron status of an individual. Accurate measures of iron absorption are thus essential in the determination of the effects of diet composition on iron absorption and status. LÄS MER

5. 4. Nutritional Limitations of a Green Protein Shift with Focus on Iron

   Författare :Cecilia Mayer Labba; Chalmers tekniska högskola; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; phytate; non-heme iron absorption; antinutrients; protein shift; protein extract; meat substitutes; plant-based; fava bean; zinc bioavailability; iron bioavailability; sustainable nutrition;

   Sammanfattning : A dietary shift into plant-based diets (PBD) to reduce the climate footprint is advocated. Effects on nutrition and health from a modern PBD, composed of replacement products based on protein extracts are however currently unknown. LÄS MER

7. 5. Biomimetic Transition Metal Catalysts : Insights from Theoretical Modeling

   Författare :Adam Johannes Johansson; Per E. M. Siegbahn; Margareta R. A. Blomberg; Per-Ola Norrby; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Catalysis; biomimetic; copper; non-heme iron; heme iron; O2 cleavage; H-atom transfer; radical chemistry; redox chemistry; thermo chemistry; entropy calculations; quantum chemistry; spin states; density functional theory DFT ; self-interaction error SIE .; Chemical physics; Kemisk fysik; kemisk fysik; Chemical Physics;

   Sammanfattning : The scientific interest in the chemistry of synthetic transition metal complexes is motivated by at least two arguments:1.These can be regarded as models of biological transition metal complexes, e.g. metalloenzymes, whose functions can be difficult to reveal in detail due to their complexity. LÄS MER